探讨了加工参数对激光熔覆孔隙率的影响。在实验上运用激光熔覆法对烧结件进行堆栈加工,探讨激光功率对熔覆后试件孔隙率的影响。在数值分析方面,以自行编写的数值分析程序,分析激光熔覆过程中因粉末温度产生的表面能差异对孔隙率的影响,比较计算与实验测量结果,发现具有一致性。旨在说明激光功率引发的表面能差异将对熔覆试件孔隙率造成影响,所得到的实验及数值分析结果可为后续研究提供依据。

This paper investigates the effects of porosity of the forming parts by laser cladding method. In the experiment,the laser cladding has been applied to build up the bulk clad on the thin layers formed by selective laser sintering,and the surface porosity with various laser powers has been characterized by imprint method. In the numerical analysis,a computation model was developed to analyze the porosity based on the surface tension and energy of cladding powders at various temperatures. The results show a good conformity between the numerical analysis and the experimental measurement.